I briefly entertained the idea of doing business a while back and it didn't last past the first meeting. The first problem was that he didn't respect the technical side, and he had a pretty technically complex idea with no clue how it'd be implemented. You don't want to tell someone how hard their job isn't unless you actually know, and even if you do, you don't make friends that way.

Another corralary tidbit is that I tend to like people who I feel I share at least some common interest with. If I say I like videogames and you immediately dismiss them as something you outgrew, I immediately have a lower impression of you. Don't let me catch you pretending though. That's pretty irritating and tells me you're not trustworthy.

Dale Carnegie does a good job of teaching how to get along with people. I was skeptical at first but he's got some good stuff.